see the doc:

https://docs.google.com/document/d/1xsR4L_sHdFjS1xAx5LEO5AJ1N9vrA17LCucF2Kmxtxo/edit?tab=t.0  

the text in the dropdowns on the download page are from here:

https://github.com/mongodb-js/compass/blob/36985b8d669b1ab86564c588169985dabc4fd60f/packages/hadron-build/commands/upload.js#L74-L96

Update mac to be 11+ and Ubuntu to be 20+ (from the scope and electron platform support)
https://github.com/electron/electron/blob/v37.2.2/README.md#platform-support